单元知识检测
教材回扣
Ⅰ.课文缩写填空
答案:1.annually　2.whose　3.kilometres　4.depth 5.driven　6.making　7.inhospitable　8.to　9.had begun　10.on
  Antarctica is the coldest and driest place on Earth.With rainfall close to zero 1. 　　　　(annual),Antarctica is technically a desert.  Antarctica holds 90% of the world’s ice,most of 2.　　　　 fresh water is in a frozen state.On average the ice cap is two 3.　　　　 .(kilometre) thick,but in some places it reaches a 4.　　　　(deep) of five kilometres.Strong winds 5.　　　　(drive)by gravity ...